package com.jindi.appuser.common;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import javax.servlet.http.HttpServletRequest;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created with IntelliJ IDEA.
 * User: duanj
 * Date: 2017-12-01
 * Time: 14:27
 * Description:
 */
public class HttpRequest {

    public static String getIPAddr(HttpServletRequest req) {
        String ip = req.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = req.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = req.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = req.getRemoteAddr();
        }
        return ip;
    }

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            System.out.println(result);
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    public static List parseXml(String xmlstr) {
        List dataList = new ArrayList();
        //1解析器 工厂 类
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
            //通过 解析器工厂创建 一个 解析 器
            DocumentBuilder db = dbf.newDocumentBuilder();
            //解析xml文件
            //  Document dm=db.parse("f://person.xml");
            //解析xml字符串
            //将该字符串转为InputStream流
            InputStream iStream = new ByteArrayInputStream(xmlstr.getBytes());
            Document dm = db.parse(iStream);
            //得到 所有 department节点
            NodeList departments = dm.getElementsByTagName("returnsms");
            for (int i = 0; i < departments.getLength(); i++) {
                Map dataMap = new HashMap();
                //element 和 node 是 同一 概念
                //不同 的 是 element 提供 更多 方法
                Element departElement = (Element) departments.item(i);
                //部门ID
                String returnstatus = departElement.getElementsByTagName("returnstatus")//部门ID
                        .item(0).getFirstChild().getNodeValue();
                //部门名称
                String message = departElement.getElementsByTagName("message")//部门名称
                        .item(0).getFirstChild().getNodeValue();
                String remainpoint = departElement.getElementsByTagName("remainpoint")//部门名称
                        .item(0).getFirstChild().getNodeValue();
                String taskID = departElement.getElementsByTagName("taskID")//部门名称
                        .item(0).getFirstChild().getNodeValue();
                String successCounts = departElement.getElementsByTagName("successCounts")//部门名称
                        .item(0).getFirstChild().getNodeValue();
                dataMap.put("returnstatus", returnstatus);
                dataMap.put("message", message);
                dataMap.put("remainpoint", remainpoint);
                dataMap.put("taskID", taskID);
                dataMap.put("successCounts", successCounts);
                dataList.add(dataMap);
            }
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (org.xml.sax.SAXException e) {
            e.printStackTrace();
        }
        return dataList;
    }
}
